公开(公告)号：US20180204036A1

公开(公告)日：2018-07-19

申请号：US15406109

申请日：2017-01-13

Applicant: SYNAPTICS INCORPORATED

Inventor： Arash AKHAVAN FOMANI ,  Kirk HARGREAVES ,  Patrick SMITH

IPC: G06K9/00

CPC classification number: G06K9/0002 ,  G06F3/0416 ,  G06F3/044 ,  G06F3/047

Abstract: Embodiments herein describe an input device that includes a rectangular array of sensor electrodes connected to sensor modules that measure capacitive sensing signals corresponding to the electrodes. During a charge stage, the input device applies a charging voltage to neighboring sensor electrodes in the array. The input device then drives the neighboring sensor electrodes to a reference voltage and measures the amount of charge accumulated on at least one of the sensor electrodes. Because of the parasitic capacitance between the neighboring electrodes, driving these electrodes (even the ones not being measured) to the same charging and reference voltages reduces the effect of the parasitic capacitance on the capacitive sensing measurement. Thus, during the read stage, the measured charge is affected primarily by the capacitance between the sensor electrodes and an input object (e.g., a finger).

公开(公告)号：US20170006223A1

公开(公告)日：2017-01-05

申请号：US14788390

申请日：2015-06-30

Applicant: SYNAPTICS INCORPORATED

Inventor： Kirk HARGREAVES ,  Patrick SMITH ,  Joseph Kurth REYNOLDS ,  Stephen L. MOREIN

IPC: H04N5/232 ,  H04N5/225 ,  G06K9/00

CPC classification number: G06K9/38 ,  G06K9/00067

Abstract: This disclosure generally provides a fingerprint sensor that derives a fingerprint by measuring capacitive sensing signals while modulating a reference voltage rail used to power the fingerprint sensor. In one embodiment, the fingerprint sensor is integrated into an electronic device which may include other components such as a display, I/O devices, speakers, and the like. To power these components, the electronic device may include a DC power supply which outputs reference voltages. When transmitting the reference voltages to the fingerprint sensor, the electronic device may modulate the voltages using a modulating signal. Because the reference voltages are used to power the components in the fingerprint sensor, modulating the rail voltages also causes the components coupled to the reference voltages to also modulate. While this modulation occurs, the fingerprint sensor measures resulting signals using a plurality of sensor electrodes which are then processed to derive a fingerprint.

Abstract translation: 本公开通常提供一种指纹传感器，其通过测量电容性感测信号而导出指纹，同时调制用于为指纹传感器供电的参考电压轨。 在一个实施例中，指纹传感器被集成到电子设备中，其可以包括诸如显示器，I / O设备，扬声器等的其他组件。 为了对这些组件供电，电子设备可以包括输出参考电压的直流电源。 当将参考电压传送到指纹传感器时，电子设备可以使用调制信号来调制电压。 由于参考电压用于为指纹传感器中的组件供电，所以调制轨道电压也会使耦合参考电压的组件也进行调制。 当这种调制发生时，指纹传感器使用多个传感器电极来测量所得到的信号，然后处理它们以导出指纹。

公开(公告)号：US20160352353A1

公开(公告)日：2016-12-01

申请号：US14726273

申请日：2015-05-29

Applicant: SYNAPTICS INCORPORATED

Inventor： Kirk HARGREAVES ,  Joseph Kurth REYNOLDS

IPC: H03M3/00 ,  G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0416 ,  H03M3/462

Abstract: A processing system that includes a sigma-delta converter and a filter unit that applies a matched filter to the output of the sigma-delta converter. The processing system drives sensor electrodes for capacitive sensing and receives resulting signals with the sensor electrodes in response. The processing system applies these resulting signals to sigma-delta converters. The matched filter boosts the signal-to-noise ratio of the signal received from the sigma-delta converter, thereby improving the ability to sense presence of an input object. The filter unit may apply different, customized matched filters for different capacitive pixels to improve the signal-to-noise ratio of each capacitive pixel in a customized manner.

Abstract translation: 一种包括Σ-Δ转换器和将匹配滤波器应用于Σ-Δ转换器的输出的滤波器单元的处理系统。 处理系统驱动用于电容感测的传感器电极并且响应于传感器电极接收结果信号。 处理系统将这些结果信号应用于Σ-Δ转换器。 匹配滤波器提高从Σ-Δ转换器接收的信号的信噪比，从而提高感测输入对象的存在的能力。 滤波器单元可以针对不同的电容像素应用不同的定制匹配滤波器，以定制的方式提高每个电容像素的信噪比。

公开(公告)号：US20160349872A1

公开(公告)日：2016-12-01

申请号：US14726081

申请日：2015-05-29

Applicant: SYNAPTICS INCORPORATED

Inventor： Kirk HARGREAVES

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/0418 ,  H03K17/9622 ,  H03K2217/960705 ,  H03K2217/960775

Abstract: A processing system that includes a charge integrator, a compensation unit, and a fine signal processing unit. The compensation unit detects when the output of the charge integrator is outside of a certain range related to the dynamic range of the charge integrator and adds or subtract charge from an input of the charge integrator in response. The compensation unit records a count of the number of times that charge is added or subtracted and produces a coarse sensing result from this count. The fine signal processing unit processes the output of the charge integrator after charge is added or removed. The compensation unit processes the coarse sensing result and adds the processed value to fine sensing result from the fine signal processing unit to obtain a final output value. This final output value is the same value as if a charge integrator with a larger dynamic range were used.

Abstract translation: 一种包括电荷积分器，补偿单元和精细信号处理单元的处理系统。 补偿单元检测电荷积分器的输出何时在与电荷积分器的动态范围相关的一定范围内，并响应于从电荷积分器的输入中加减电荷。 补偿单元记录添加或减少电荷次数的计数，并从该计数产生粗略检测结果。 精细信号处理单元在添加或移除电荷后处理电荷积分器的输出。 补偿单元处理粗略检测结果，并将经处理的值与精细信号处理单元的精细检测结果相加，以获得最终输出值。 该最终输出值与使用较大动态范围的电荷积分器的值相同。